NATURAL SCIENCES OF PHILADELPHIA. 17 



Meig. The position of the clouds round the stigma is quite different in these 

 species; likewise, the insect which I have redescribed under the name of L. 

 morio Fair, is different from the European insect of that name. Although 

 I had no American specimen at hand for comparison, I could perceive at once 

 that the wings of the European ones were less infuscated. I restore, therefore, 

 to the American species the name ofL. morioides, which I at first intended 

 for it. 



Limnophila f as ciat a Linn. andRhipidia m ac ul at a Meig. have not struck 

 me as being different from the American species which I have re-described 

 under the same names ; still, as I had no specimens of the latter for comparison, 

 I would not rely on a mere impression. 



My Amalopis inconstans has the greatest resemblance with Limnobia 

 littoralis Meig. My A. auripennis is closely related to A. occulta. 

 Other cases of analogy which I observed are between Pedicia albivitta 

 Walk., and P. rivosa, Dactylolabis montanaO.&rf., and Limnophila 

 sexmaculata Meig., Limnobia c i n c t i p e s Say. and L. a n n u 1 u s Meig., 

 L. solitaria and L. quadrinotata. 



In establishing the genus Elephantomyia, T had ventured the suppo- 

 sition that Toxorhina Loew had been founded on female specimens 011I3-, 

 and that, if the males were known, the neuration of their wings would be found 

 to be like that of the males of Limnobiorhynchus Westw., that is, 

 considerably different from the females. This supposition has proved correct. 

 Mr. Loew has obtained since several male specimens of Toxorhina (fossil.) 

 They have a distinct radial vein, which, as usual, runs between the cubital and 

 the radial areae. The question of the synonymy of Limnobiorhynchus 

 and Toxorhina may therefore be considered as settled. 



The examination of specimens of Macrochile Loew included in amber, 

 proved that this genus, like my Protoplasa, has the anal angle of the 

 wing square and not rounded. 



Note. In the analytical table on p. 232 (Proc. 1859,) the fifth line should 

 be continuous with the fourth, the species L. fuscovaria forming in fact 

 the group Dicranophragma. 



Catalogue of the Mollusks in the vicinity of Mohawk, New York. 



BY JAMES LEWIS, M. D. 



The following Catalogue embraces the various species of shell-bearing Mol- 

 lusca, observed in the vicinity of Mohawk, Herkimer Co., N. Y., and in various 

 small Lakes a few miles south of Mohawk. Some of the species referred to 

 have been entered here, from a single dead specimen. 



Unio complanatus Lea. Erie canal and Mohawk river. Common, 

 radiatus Lamarck. Lakes. Abundant, 

 cariosus Say. Mohawk river. Nearly or quite extinct, 

 ochraceus Say. " " " ;< " 



Tappanianus Lea. " " Very rare, 



luteolus Lam. " " Very rarely seen. 



Margaritana rugosa Barnes. Canal and river. Common. 



marginata Say. " " Not plenty, 



undulata Say. Lakes. One seen in river. Rare. 

 Anodonta fluviatilis Lea. Canal. Rare. Streams south, less rare, 

 lacustris Lea. Lakes. Abundant. (Nov. sp.) 

 Lewisii Lea. Canal. " " 



edentula Say. " Rare. Streams south, common. 

 Ferussaciana Lea. Canal and rivers. Small and rare 

 imbecilis Say. " " " 



subcylindracea Lea. Herkimer. 

 I860.] 2 



